Page 61 - kursus eBook

DRAFT GUIDELINE ON DOMESTIC GAS PIPING SYSTEM

Pipe support

The piping system must be supported to avoid the external strength such as vibration,
thermal shrinkage and must be installed at a location where maintenance work can be done
easily.
Gas piping shall be supported with the proper size pipe hooks, metal pipe straps, bands or
hangers.

The supports must be of adequate strength and quality, and located at proper intervals, so
that the piping cannot be moved accidentally from the installed position.

The building structure shall not be weakened by the installation of any gas piping. Gas
piping shall not be supported by other piping.

Spacing of supports in gas piping installations shall not be greater than as shown below
(taken from table 2 of MS 930):

Steel Pipe Nominal
Nominal Size Spacing of Size of Spacing of
of Pipe Supports Tubing Supports
(Inches) (Feet) (Inch OD) (Feet)
1/2 6 1/2 4
3/4 or 1 8 5/8 or 3/4 6
1 1/4 or
larger 10 7/8 or 1 8
(horizontal)
1 1/4 or Every
larger
(vertical) floor level

Pipe Tracer Wire

For polyethylene (PE) underground gas piping installation, a tracer wire is installed along the
entire length of gas pipe for the purpose of locating the gas pipe from aboveground using a
pipe locator.
The tracer wire should be installed around the pipe surface and the wire ends should be led
to aboveground, at appropriate intervals, where the discontinuity can be detected easily.

An insulated copper wire of at least 4 mm should be used as tracer wire.

Clearance from Other Buried Facilities

When a gas pipe runs close to some other services, contact between them shall be
prevented by segregation or other means. Requirements for clearance (parallel and cross
layout distances) from other buried facilities is as shown in the figure below:

For polyethylene pipe installation, ample clearance must be provided to separate such pipe
from any heat source in order to assure that the surface temperature of the pipe does not
o
exceed 35 C

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